Herbicide mixtures employing O,S-dimethyltetrachlorothioterephthalate

ABSTRACT

Herbicide compositions of mixtures in the weight ratio of 5:1 to 1:3 of (a) 3-lower alkyl-2,1,3-benzothiadiazinone-(4)-2,2-dioxide and (b) O,S-dimethyltetrachlorothioterephthalate.

RELATED APPLICATION

This application is a continuation-in-part of application Ser. No.432,686, filed Jan. 11, 1974 now abandoned, which in turn is a divisionof copending application Ser. No. 343,629, filed Mar. 22, 1973 now U.S.Pat. No. 3,888,655, the disclosure of which is incorporated herein byreference.

The present invention relates to a herbicide comprising a composition ofseveral active ingredients.

It is known that substituted phenyl ethers, carbamates, terephthalates,acid amides, benzoic acids, fluoroenecarboxylic acids andbenzothiadiazinones have a herbicidal action. However, this action ispoor.

It has been found that a composition of

A. a compound of the formula ##SPC1##

Where R denotes lower alkyl of a maximum of 4 carbon atoms, or itssalts, such as alkali metal, alkaline earth metal, ammonium,hydroxyalkylammonium, alkylammonium and hydrazine salts, e.g. salts withsodium, lithium, potassium, calcium, iron, methylammonium,trimethylammonium, ethylammonium, diethanolammonium, ethanolammonium,dimethylamine, dimethylethanolamine, hydrazine and phenylhydrazine, and

B. O,S-dimethyltetrachlorothioterephthalate have a herbicidal actionsuperior to that of their individual components.

Active ingredients a and b may be applied in amounts of 0.5 to kg perhectare.

The weight ratio of a : b, is from 5:1 to 1:3, preferably from 3:1 to1:3.

The compositions of the invention are suitable for controlling unwantedplants, e.g. dicotyledonous seed weeds, monocotyledonous grassy seedweeds and Cyperaceae in crops such as cereals, rice, soybeans, Indiancorn, potatoes, peas, and beans.

The compositions may be used pre- and/or postemergence.

The agents according to the invention may be used as solutions,emulsions, suspensions oil dispersions, granules or dusts. The form ofapplication depends entirely on the purpose for which the agents arebeing used; in any case it should ensure a fine distribution of theactive ingredient.

For the preparation of solutions to be sprayed direct, mineral oilfractions of medium to high boiling point, such as kerosene or dieseloil, further coal-tar oils and oils of vegetable or mineral origin, andcyclic hydrocarbons such as tetrahydronaphthalene and alkylatednaphthalenes are suitable.

Aqueous formulations may be prepared from emulsion concentrates, pastesor wettable powders by adding water. To prepare emulsions theingredients as such or dissolved in a solvent may be homogenized inwater or organic solvents by means of wetting or dispersing agents,e.g., polyethylene oxide adducts. Concentrates which are suitable fordilution with water may be prepared from active ingredient, wettingagent, adherent, emulsifying or dispersing agent and possibly solvent.Oils of various types may be added to ready-to-use spray liquors.

Dusts may be prepared by mixing or grinding the active ingredients witha solid carrier, e.g., clay or fertilizers.

Granules may be prepared by bonding the active ingredients to solidcarriers.

Directly sprayable dispersions may also be prepared with oils.

The new compounds may be mixed with fertilizers, insecticides,fungicides and other herbicides.

EXAMPLE 1

In the greenhouse various plants were treated at a growth height of from1 to 20 cm with the following amounts of the following individual activeingredients and compositions thereof as emulsions, dispersions, aqueoussolutions or oil dispersions.

I 3-isopropyl-2,1,3-benzothiadiazinone-(4)-2,2-dioxide, 0.5, 0.75, 1 and1.5 kg/ha;

II 3-isopropyl-2,1,3-benzothiadiazinone-(4)-2,2-dioxide, sodium salt,0.5, 0.75, 1 and 1.5 kg/ha;

III 3-isopropyl-2,1,3-benzothiadiazinone-(4)-2,2-dioxide, dimethylaminesalt 0.5, 0.75, 1 and 1.5 kg/ha;

IV 3-isopropyl-2,1,3-benzothiadiazinone-(4)-2,2 dioxide diethanolaminesalt, 0.5, 0.75, 1 and 1.5 kg/ha;

V O,S-dimethyltetrachlorothioterephthalate; 0.5, 0.75, 1 and 1.5 kg/ha;

I + V, II + V, III + V and IV + V

each of these compositions at rates of 0.5 + 1, 1 + 0.5 and

0.75 + 0.75 kg/ha.

After 2 to 3 weeks it was ascertained that the compositions had a betterherbicidal action than their components, combined with the same goodcrop plant compatibility.

The results are given below:

    __________________________________________________________________________    Active Ingredient                                                                       I    II         III        IV         V                             kg/ha     0.5                                                                             0.75                                                                             1 1.5                                                                             0.5 0.75                                                                             1 1.5                                                                             0.5 0.75                                                                             1 1.5                                                                             0.5 0.75                                                                             1 1.5                                                                             0.5 0.75                                                                             1 1.5              __________________________________________________________________________    Crop plants:                                                                  Oryza sativa                                                                            0 0  0 0 0   0  0 0 0   0  0 0 0   0  0 0 0   0     5                                                                       10                    Triticum aestivum                                                                       0 0  0 0 0   0  0 0 0   0  0 0 0   0  0 0 0   0     0                                                                       5                     Glycine Max                                                                             0 0  0 0 0   0  0 0 0   0  0 0 0   0  0 0 0   0     0                                                                       10                    Unwanted plants:                                                              Alopecurus mysosur                                                                      2 5  5 10                                                                              3   8  12                                                                              15                                                                              5   7  10                                                                              16                                                                              4   7  12                                                                              15                                                                              15  20    30                                                                      40                    Echinochloa crus-                                                             galli     4 7  10                                                                              10                                                                              2   8  10                                                                              15                                                                              5   9  10                                                                              15                                                                              7   10 12                                                                              17                                                                              20  30    40                                                                      50                    Galium aparine                                                                          30                                                                              35 40                                                                              60                                                                              30  40 45                                                                              60                                                                              28  40 50                                                                              60                                                                              35  45 60                                                                              67                                                                              0   0     5                                                                       10                    Sinapis arvensis                                                                        30                                                                              45 60                                                                              75                                                                              25  40 50                                                                              75                                                                              30  40 55                                                                              80                                                                              30  42 62                                                                              85                                                                              0   2     7                                                                       14                    __________________________________________________________________________      0 = no damage                                                                100 = complete destruction                                               

    Active ingredient                                                                        I+V     II+V        III+V       IV+V                                          0.5 1   0.75                                                                              0.5 1   0.75                                                                              0.5 1   0.75                                                                              0.5 1   0.75                   kg/ha      1   0.5 0.75                                                                              1   0.5 0.75                                                                              1   0.5 0.75                                                                              1   0.5 0.75                   __________________________________________________________________________    Crop plants:                                                                  Oryza sativa                                                                             5   0   0   5   0   0   5   0   0   5   0   0                      Triticum aestivum                                                                        0   0   0   0   0   0   0   0   0   0   0   0                      Glycine max                                                                              0   0   0   0   0   0   0   0   0   0   0   0                      Unwanted plants:                                                              Alopecurus myosuroi-                                                          des        68  60  70  70  65  70  74  68  70  75  70  70                     Echinochloa crus-                                                             galli      80  75  75  80  70  72  90  84  85  90  70  80                     Galium aparine                                                                           72  85  80  70  87  80  70  90  80  84  95  92                     Sinapis arvensis                                                                         80  96  90  78  90  84  80  98  90  80  100 90                     __________________________________________________________________________      0 = no damage                                                                100 = complete destruction                                               

EXAMPLE 2

In the greenhouse, various plants were treated at a growth height offrom 1 to 20 cm with the following amounts of the following individualactive ingredients and compositions thereof as dispersions, emulsions,aqueous solutions and oil dispersions:

I 3-isopropyl-2,1,3-benzothiadiazinone-(4)-2,2-dioxide;

II 3-isopropyl-2,1,3-benzothiadiazinone-(4)-2,2-dioxide, sodium salt;

III 3-isopropyl-2,1,3-benzothiadiazinone-(4)-2,2-dioxide, dimethylaminesalt;

IV 3-isopropyl-2,1,3-benzothiadiazinone-(4)-2,2-dioxide, diethanolaminesalt;

V O,S-dimethyltetrachlorothioterephthalate;

each of these compounds at rates of 0.5, 1, 1.5, 2, 2.5 and 3 kg/ha;

I + v, ii + v, iii + v and IV + V each at rates of 2.5 + 0.5, 0.5 + 1.5,2 + 1, 1 + 1 and 1.5 + 1.5 kg/ha.

After 2 to 3 weeks it was ascertained that the compositions had bettercrop plant compatibility and a better herbicidal action than theircomponents.

The results are given below:Active ingredient I II IIIkg/ha 0.5 1 1.5 22.5 3 0.5 1 1.5 2 2.5 3 0.5 1 1.5 2 2.53__________________________________________________________________________Cropplants:Oryza sativa 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0Triticum aestivum0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0Glycine max 0 0 0 0 5 10 0 0 0 0 5 150 0 0 0 7 12Unwanted plants:Alopecurus myosuroides 2 5 10 20 25 30 3 1215 18 20 25 5 10 16 24 26 30Echinochloa crus-galli 4 8 10 10 10 15 2 1015 24 25 30 5 10 15 20 23 25Galium aparine 30 40 60 75 90 95 30 45 60 8090 94 28 50 60 75 9095__________________________________________________________________________

    Active ingredient                                                                         IV                V               I+V                             kg/ha       0.5                                                                              1  1.5                                                                              2  2.5                                                                              3  0.5                                                                              1  1.5 2  3  2.5                                                                              0.5                                                                              2   1  1.5                                                              0.5                                                                              1.5                                                                              1   1  1.5                __________________________________________________________________________    Crop plants:                                                                  Oryza sativa                                                                              0  0  0  0  0  0  0  5  10  20 30 0  10 5   5  10                 Triticum aestivum                                                                         0  0  0  0  0  0  0  0  5   10 25 0  5  0   0  5                  Glycine max 0  0  0  0  5  10 0  0  10  15 25 5  10 0   0  10                 Unwanted plants:                                                              Alopecurus myosuroides                                                                    4  12 15 19 23 25 15 30 40  50 80 85 90 90  75 90                 Echinochloa crus-galli                                                                    7  12 17 24 27 30 20 40 50  55 85 87 98 100 90 100                Galium aparine                                                                            35 60 67 80 90 95 0  5  10  15 25 100                                                                              87 100 90 100                __________________________________________________________________________

    Active ingredient                                                                          II+V           III+V          IV+V                               kg/ha        2.5                                                                              0.5                                                                              2  1  1.5                                                                              2.5                                                                              0.5                                                                              2  1  1.5                                                                              2.5                                                                              0.5                                                                              2  1  1.5                                 0.5                                                                              1.5                                                                              1  1  1.5                                                                              0.5                                                                              1.5                                                                              1  1  1.5                                                                              0.5                                                                              1.5                                                                              1  1  1.5                    __________________________________________________________________________    Crop plants:                                                                  Oryza sativa 0  10 5  5  10 0  10 5  5  10 0  10 5  5  10                     Triticum aestivum                                                                          0  5  0  0  5  0  5  0  0  5  0  5  0  0  5                      Glycine max  5  10 0  0  10 7  10 0  0  10 5  10 0  0  10                     Unwanted plants:                                                              Alopecurus myosuroides                                                                     84 80 90 80 95 90 90 100                                                                              78 96 85 90 90 80 100                    Echinochloa crus-galli                                                                     88 87 100                                                                              90 100                                                                              90 98 100                                                                              90 100                                                                              90 95 100                                                                              90 100                    Gallium aparine                                                                            100                                                                              85 100                                                                              95 100                                                                              100                                                                              82 100                                                                              98 100                                                                              100                                                                              90 100                                                                              100                                                                              100                    __________________________________________________________________________       0 = no damage                                                               100 = complete destruction                                               

I claim:
 1. A herbicide composition comprising an inert carrier havingdispersed therein a herbicidally effective amount of a mixtureconsisting essentially ofa. a compound of the formula ##SPC2##where Rdenotes lower alkyl of a maximum of 4 carbon atoms, or an alkali metal,alkaline earth metal, ammonium, lower alkylammonium, lowerhydroxyalkylammonium or hydrazine salt thereof, and b.O,S-dimethyltetrachlorothioterephthalate, in a weight ratio of a:b, of5:1 to 1:3.
 2. A herbicide composition as claimed in claim 1 whereinsaid weight ratio is 3:1 to 1:3.
 3. A herbicide composition as claimedin claim 1 wherein R denotes isopropyl.
 4. A process for controlling thegrowth of unwanted plants among crop plants which comprises applying tosaid plants a herbicidally effective amount of a mixture consistingessentially ofa. a compound of the formula ##SPC3##where R denotes loweralkyl of a maximum of 4 carbon atoms, or an alkali metal, alkaline earthmetal, ammonium, lower alkylammonium, lower hydroxyalkylammonium orhydrazine salt thereof, and b. O,S-dimethyltetrachlorothioterephthalate,in a weight ratio of a:b, of 5:1 to 1:3.
 5. A process as claimed inclaim 4 wherein said weight ratio is 3:1 to 1:3.
 6. A process as claimedin claim 4 wherein R in compound a is isopropyl.